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本文提出了一种3.24至8.45GHz的低相位噪声模式切换振荡器，用于蜂窝通信中的宽频带覆盖。通过模式切换技术扩展VCO频率范围，并利用分频2产生I/Q信号，满足不同标准的相位噪声要求。
Qualcomm, San Jose, CA 1 2 VCO design for cellular applications to achieve universal coverage for a wide range of frequencies (400MHz to 3700MHz) in different standards and meeting stringent out-of-band and in-band phase-noise (PN) requirements is a challenging task. The simplest method to generate I and Q signals in the LO is to use a frequency divide-by-2 which requires the VCO frequency to be an even multiple of fLO. This method is area efficient and superior for coexistence as it does not generate jammers in other bands. The technique in this work expands the VCO frequency range to ensure 2xfLO for all cellular bands, notably 3700MHz, with sufficient margin, and meets the most stringent PN specification for a SAW-less GSM transceiver. There is a trade-off between a VCO tuning range and its PN [1]. One way to obtain desired PN over a wide frequency range is to divide it into smaller sub-bands and assign a separate VCO to each sub-band. This significantly
Mazhareddin Taghivand1,2, Kamal Aggarwal1, Ada S. Y. Poon1
Stanford University, Stanford, CA,